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gimp/app/core/gimpcontainer.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "apptypes.h"
#include "gimpcontainer.h"
#include "gimpmarshal.h"
typedef struct _GimpContainerHandler
{
gchar *signame;
GtkSignalFunc func;
gpointer user_data;
GQuark quark; /* used to attach the signal id's of child signals */
} GimpContainerHandler;
enum
{
ADD,
REMOVE,
HAVE,
FOREACH,
GET_CHILD_BY_NAME,
GET_CHILD_BY_INDEX,
GET_CHILD_INDEX,
LAST_SIGNAL
};
/* local function prototypes */
static void gimp_container_init (GimpContainer *container);
static void gimp_container_class_init (GimpContainerClass *klass);
static void gimp_container_destroy (GtkObject *object);
static void gimp_container_child_destroy_callback (GtkObject *object,
gpointer data);
static guint container_signals[LAST_SIGNAL] = { 0 };
static GimpObjectClass *parent_class = NULL;
GtkType
gimp_container_get_type (void)
{
static GtkType container_type = 0;
if (! container_type)
{
GtkTypeInfo container_info =
{
"GimpContainer",
sizeof (GimpContainer),
sizeof (GimpContainerClass),
(GtkClassInitFunc) gimp_container_class_init,
(GtkObjectInitFunc) gimp_container_init,
/* reserved_1 */ NULL,
/* reserved_2 */ NULL,
(GtkClassInitFunc) NULL
};
container_type = gtk_type_unique (GIMP_TYPE_OBJECT, &container_info);
}
return container_type;
}
static void
gimp_container_init (GimpContainer *container)
{
container->children_type = GIMP_TYPE_OBJECT;
container->policy = GIMP_CONTAINER_POLICY_STRONG;
container->num_children = 0;
container->handlers = NULL;
}
static void
gimp_container_class_init (GimpContainerClass* klass)
{
GtkObjectClass *object_class;
object_class = (GtkObjectClass *) klass;
parent_class = gtk_type_class (GIMP_TYPE_OBJECT);
container_signals[ADD] =
gtk_signal_new ("add",
GTK_RUN_FIRST,
object_class->type,
GTK_SIGNAL_OFFSET (GimpContainerClass,
add),
gtk_marshal_NONE__OBJECT,
GTK_TYPE_NONE, 1,
GIMP_TYPE_OBJECT);
container_signals[REMOVE] =
gtk_signal_new ("remove",
GTK_RUN_FIRST,
object_class->type,
GTK_SIGNAL_OFFSET (GimpContainerClass,
remove),
gtk_marshal_NONE__OBJECT,
GTK_TYPE_NONE, 1,
GIMP_TYPE_OBJECT);
container_signals[HAVE] =
gtk_signal_new ("have",
GTK_RUN_LAST,
object_class->type,
GTK_SIGNAL_OFFSET (GimpContainerClass,
have),
gtk_marshal_BOOL__POINTER,
GTK_TYPE_BOOL, 1,
GIMP_TYPE_OBJECT);
container_signals[FOREACH] =
gtk_signal_new ("foreach",
GTK_RUN_FIRST,
object_class->type,
GTK_SIGNAL_OFFSET (GimpContainerClass,
foreach),
gtk_marshal_NONE__POINTER_POINTER,
GTK_TYPE_NONE, 2,
GTK_TYPE_POINTER,
GTK_TYPE_POINTER);
container_signals[GET_CHILD_BY_NAME] =
gtk_signal_new ("get_child_by_name",
GTK_RUN_LAST,
object_class->type,
GTK_SIGNAL_OFFSET (GimpContainerClass,
get_child_by_name),
gimp_marshal_POINTER__POINTER,
GIMP_TYPE_OBJECT, 1,
GTK_TYPE_POINTER);
container_signals[GET_CHILD_BY_INDEX] =
gtk_signal_new ("get_child_by_index",
GTK_RUN_LAST,
object_class->type,
GTK_SIGNAL_OFFSET (GimpContainerClass,
get_child_by_index),
gimp_marshal_POINTER__INT,
GIMP_TYPE_OBJECT, 1,
GTK_TYPE_INT);
container_signals[GET_CHILD_INDEX] =
gtk_signal_new ("get_child_index",
GTK_RUN_LAST,
object_class->type,
GTK_SIGNAL_OFFSET (GimpContainerClass,
get_child_index),
gtk_marshal_INT__POINTER,
GTK_TYPE_INT, 1,
GIMP_TYPE_OBJECT);
gtk_object_class_add_signals (object_class, container_signals, LAST_SIGNAL);
object_class->destroy = gimp_container_destroy;
klass->add = NULL;
klass->remove = NULL;
klass->have = NULL;
klass->foreach = NULL;
klass->get_child_by_name = NULL;
klass->get_child_by_index = NULL;
klass->get_child_index = NULL;
}
static void
gimp_container_destroy (GtkObject *object)
{
GimpContainer *container;
container = GIMP_CONTAINER (object);
while (container->handlers)
{
gimp_container_remove_handler
(container,
((GimpContainerHandler *) container->handlers->data)->quark);
}
if (GTK_OBJECT_CLASS (parent_class)->destroy)
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
gimp_container_child_destroy_callback (GtkObject *object,
gpointer data)
{
GimpContainer *container;
container = GIMP_CONTAINER (data);
gimp_container_remove (container, GIMP_OBJECT (object));
}
GtkType
gimp_container_children_type (const GimpContainer *container)
{
return container->children_type;
}
GimpContainerPolicy
gimp_container_policy (const GimpContainer *container)
{
return container->policy;
}
gint
gimp_container_num_children (const GimpContainer *container)
{
return container->num_children;
}
gboolean
gimp_container_add (GimpContainer *container,
GimpObject *object)
{
GimpContainerHandler *handler;
GList *list;
guint handler_id;
g_return_val_if_fail (container != NULL, FALSE);
g_return_val_if_fail (GIMP_IS_CONTAINER (container), FALSE);
g_return_val_if_fail (object != NULL, FALSE);
g_return_val_if_fail (GTK_CHECK_TYPE (object, container->children_type),
FALSE);
if (gimp_container_have (container, object))
{
g_warning ("%s(): container already contains object %p",
G_GNUC_FUNCTION, object);
return FALSE;
}
for (list = container->handlers; list; list = g_list_next (list))
{
handler = (GimpContainerHandler *) list->data;
handler_id = gtk_signal_connect (GTK_OBJECT (object),
handler->signame,
handler->func,
handler->user_data);
gtk_object_set_data_by_id (GTK_OBJECT (object), handler->quark,
GUINT_TO_POINTER (handler_id));
}
switch (container->policy)
{
case GIMP_CONTAINER_POLICY_STRONG:
gtk_object_ref (GTK_OBJECT (object));
gtk_object_sink (GTK_OBJECT (object));
break;
case GIMP_CONTAINER_POLICY_WEAK:
gtk_signal_connect (GTK_OBJECT (object), "destroy",
GTK_SIGNAL_FUNC (gimp_container_child_destroy_callback),
container);
break;
}
container->num_children++;
gtk_signal_emit (GTK_OBJECT (container), container_signals[ADD], object);
return TRUE;
}
gboolean
gimp_container_remove (GimpContainer *container,
GimpObject *object)
{
GimpContainerHandler *handler;
GList *list;
guint handler_id;
g_return_val_if_fail (container, FALSE);
g_return_val_if_fail (GIMP_IS_CONTAINER (container), FALSE);
g_return_val_if_fail (object != NULL, FALSE);
g_return_val_if_fail (GTK_CHECK_TYPE (object, container->children_type),
FALSE);
if (! gimp_container_have (container, object))
{
g_warning ("%s(): container does not contains object %p",
G_GNUC_FUNCTION, object);
return FALSE;
}
for (list = container->handlers; list; list = g_list_next (list))
{
handler = (GimpContainerHandler *) list->data;
handler_id = GPOINTER_TO_UINT
(gtk_object_get_data_by_id (GTK_OBJECT (object), handler->quark));
if (handler_id)
{
gtk_signal_disconnect (GTK_OBJECT (object), handler_id);
gtk_object_set_data_by_id (GTK_OBJECT (object), handler->quark, NULL);
}
}
gtk_object_ref (GTK_OBJECT (object));
switch (container->policy)
{
case GIMP_CONTAINER_POLICY_STRONG:
gtk_object_unref (GTK_OBJECT (object));
break;
case GIMP_CONTAINER_POLICY_WEAK:
gtk_signal_disconnect_by_func
(GTK_OBJECT (object),
GTK_SIGNAL_FUNC (gimp_container_child_destroy_callback),
container);
break;
}
container->num_children--;
gtk_signal_emit (GTK_OBJECT (container), container_signals[REMOVE],
object);
gtk_object_unref (GTK_OBJECT (object));
return TRUE;
}
gboolean
gimp_container_have (GimpContainer *container,
GimpObject *object)
{
gboolean have = FALSE;
g_return_val_if_fail (container != NULL, FALSE);
g_return_val_if_fail (GIMP_IS_CONTAINER (container), FALSE);
if (container->num_children < 1)
return FALSE;
gtk_signal_emit (GTK_OBJECT (container), container_signals[HAVE],
object, &have);
return have;
}
void
gimp_container_foreach (GimpContainer *container,
GFunc func,
gpointer user_data)
{
g_return_if_fail (container != NULL);
g_return_if_fail (GIMP_IS_CONTAINER (container));
g_return_if_fail (func != NULL);
if (container->num_children > 0)
gtk_signal_emit (GTK_OBJECT (container), container_signals[FOREACH],
func, user_data);
}
GimpObject *
gimp_container_get_child_by_name (const GimpContainer *container,
const gchar *name)
{
GimpObject *object = NULL;
g_return_val_if_fail (container != NULL, NULL);
g_return_val_if_fail (GIMP_IS_CONTAINER (container), NULL);
g_return_val_if_fail (name != NULL, NULL);
gtk_signal_emit (GTK_OBJECT (container), container_signals[GET_CHILD_BY_NAME],
name, &object);
return object;
}
GimpObject *
gimp_container_get_child_by_index (const GimpContainer *container,
gint index)
{
GimpObject *object = NULL;
g_return_val_if_fail (container != NULL, NULL);
g_return_val_if_fail (GIMP_IS_CONTAINER (container), NULL);
g_return_val_if_fail (index >= 0 && index < container->num_children, NULL);
gtk_signal_emit (GTK_OBJECT (container), container_signals[GET_CHILD_BY_INDEX],
index, &object);
return object;
}
gint
gimp_container_get_child_index (const GimpContainer *container,
const GimpObject *object)
{
gint index = -1;
g_return_val_if_fail (container != NULL, -1);
g_return_val_if_fail (GIMP_IS_CONTAINER (container), -1);
g_return_val_if_fail (object != NULL, -1);
g_return_val_if_fail (GTK_CHECK_TYPE (object, container->children_type), -1);
gtk_signal_emit (GTK_OBJECT (container), container_signals[GET_CHILD_INDEX],
object, &index);
return index;
}
static void
gimp_container_add_handler_foreach_func (GimpObject *object,
GimpContainerHandler *handler)
{
guint handler_id;
handler_id = gtk_signal_connect (GTK_OBJECT (object),
handler->signame,
handler->func,
handler->user_data);
gtk_object_set_data_by_id (GTK_OBJECT (object), handler->quark,
GUINT_TO_POINTER (handler_id));
}
GQuark
gimp_container_add_handler (GimpContainer *container,
const gchar *signame,
GtkSignalFunc callback,
gpointer callback_data)
{
GimpContainerHandler *handler;
gchar *key;
g_return_val_if_fail (container != NULL, 0);
g_return_val_if_fail (GIMP_IS_CONTAINER (container), 0);
g_return_val_if_fail (signame != NULL, 0);
g_return_val_if_fail (gtk_signal_lookup (signame,
container->children_type), 0);
g_return_val_if_fail (callback != NULL, 0);
handler = g_new (GimpContainerHandler, 1);
/* create a unique key for this handler */
key = g_strdup_printf ("%s-%p", signame, handler);
handler->signame = g_strdup (signame);
handler->func = callback;
handler->user_data = callback_data;
handler->quark = g_quark_from_string (key);
g_free (key);
container->handlers = g_list_prepend (container->handlers, handler);
gimp_container_foreach (container,
(GFunc) gimp_container_add_handler_foreach_func,
handler);
return handler->quark;
}
static void
gimp_container_remove_handler_foreach_func (GimpObject *object,
GimpContainerHandler *handler)
{
guint handler_id;
handler_id =
GPOINTER_TO_UINT (gtk_object_get_data_by_id (GTK_OBJECT (object),
handler->quark));
if (handler_id)
{
gtk_signal_disconnect (GTK_OBJECT (object), handler_id);
gtk_object_set_data_by_id (GTK_OBJECT (object), handler->quark, NULL);
}
}
void
gimp_container_remove_handler (GimpContainer *container,
GQuark id)
{
GimpContainerHandler *handler;
GList *list;
g_return_if_fail (container != NULL);
g_return_if_fail (GIMP_IS_CONTAINER (container));
g_return_if_fail (id != 0);
for (list = container->handlers; list; list = g_list_next (list))
{
handler = (GimpContainerHandler *) list->data;
if (handler->quark == id)
break;
}
if (! list)
{
g_warning ("tried to disconnect handler which is not connected");
return;
}
gimp_container_foreach (container,
(GFunc) gimp_container_remove_handler_foreach_func,
handler);
container->handlers = g_list_remove (container->handlers, handler);
g_free (handler->signame);
g_free (handler);
}
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